A natural harbour situated at the entrance of the Zuari estuary is ________.

Marmagao Port

The correct answer is Option (3) → Marmagao Port

Marmagao Port, situated at the entrance of the Zuari estuary, is a natural harbour in Goa. It gained significance after its remodelling in 1961 to handle iron-ore exports to Japan. Construction of Konkan railway has considerably extended the hinterland of this port. Karnataka, Goa, Southern Maharashtra constitute its hinterland.